id:A034808 - OEIS Search Results

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Concatenation of 'prevprime(n) and n' is a prime.

+0
14

3, 9, 37, 39, 51, 63, 87, 89, 111, 117, 123, 153, 157, 163, 173, 177, 183, 207, 211, 213, 217, 219, 239, 249, 257, 263, 267, 269, 273, 277, 279, 289, 321, 323, 327, 333, 337, 339, 343, 359, 369, 379, 407, 423, 439, 441, 459, 471, 473, 477, 479, 489, 497, 513 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`n=333 -> previous prime is 331, thus '331333' is a prime.`
	CROSSREFS	`Cf. A034809-A034821.` `Sequence in context: A128094 A135474 A076964 this_sequence A018398 A134818 A002751` `Adjacent sequences: A034805 A034806 A034807 this_sequence A034809 A034810 A034811`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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